>>29796077>1 - High CP attackersExeggutor, Vaporeon, Victreebel, Arcanine, Dragonite, Lapras, Gyarados, Poliwrath, Vileplume
>2 - High CP defendersSnorlax, Lapras, Dragonite, Exeggutor, Arcanine, Slowbro, Poliwrath
>3 - Low CP attackersAnything from 1 at a low CP, Jolteon, Starmie, Dewgong, Flareon, Parasect, Pidgeot, Seadra, Omastar
My personal favorites from group 3 are Jolteon, Parasect, and a low CP Vaporeon. I also like to use Marowak and Nidoking because they were my bros when I first got Blue version but they don't always work.
IVs matter for group 2 mostly. If you catch a fully evolved Pokemon in the wild with a 800-1200 CP, only its moveset really matters for attacking. If you're evolving something then good IVs are better but its final moveset is most important. If you're powering something up to put in a gym then almost perfect IVs will get you higher in the gym which is what really matters.
>>29796234Is also right